As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT CODE 73-31351 "THE APL VOLTAGE INPUT TO THE EEC IS OUT OF RANGE" SHORT TIME FAULT DISPLAYED ON CDU FOR NR 1 ENGINE, ESN896628. ACFT GROUNDED. ACCOMPLISHED TC78273000 NO FAULTS FOUND ON RECENT OR HISTORY FOR NR 1 ENGINE THIS CLEARS THIS PLT.